feat: created string permutation distance calculator; added comments explaining each line of code;

Author: “A1-4U2T1NN”

lesson_13/maps_java/maps_app/src/main/java/com/codedifferently/lesson13/Lesson13.java

@@ -5,8 +5,24 @@ public class Lesson13 {
   /**
    * Provide the solution to LeetCode 3146 here:
    * https://leetcode.com/problems/permutation-difference-between-two-strings
+   * You are given two strings s and t such that every character occurs at most once in s and t is a permutation of s. 
+   * The permutation difference between s and t is defined as 
+   * the sum of the absolute difference between the index of the occurrence 
+   * of each character in s and the index of the occurrence of the same character in t. 
+   * Return the permutation difference between s and t.
    */
   public int findPermutationDifference(String s, String t) {
-    return 0;
+    
+    int permuDifference = 0;
+    // Created a counter to track Permutation Difference
+    for (int i = 0; i < s.length(); i++) {
+      // Loops through each letter in string 's'
+      int difference = s.indexOf(s.charAt(i)) - t.indexOf(s.charAt(i));
+      // Subtracts possitional value of string 't' from the possitional value of string 's'
+      permuDifference += Math.abs(difference);
+      // Converts difference into absolute value and adds it to the Permutation Difference
+    }
+    return permuDifference;
+    // Returns the total Permutation Difference value
   }
 }